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Unsolved Problems in Number Theory, Paperback by Guy, Richard, ISBN 1441919287, ISBN-13 9781441919281, Brand New, Free shipping in the US Mathematics is kept alive by the appearance of new, unsolved problems. This book provides a steady supply of easily understood, if not easily solved, problems that can be considered in varying depths by mathematicians at all levels of mathematical maturity. This new edition features lists of references to OEIS, Neal Sloane’s Online Encyclopedia of Integer Sequences, at the end of several of the sections.
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